Chimney aspirator

ABSTRACT

Insulating material surrounds the outwardly disposed exhaust end portion of a chimney and a jacket, having inlet and outlet ports, loosely surrounds the insulated end portion of the chimney. A blower communicates with the inlet port of the jacket and moves ambient air therethrough generating a venturi action for the exhaust end of the chimney.

United States Patent 401,836 4/1889 Hodel lnventor Myron E. HemmingsonBox 101, Fletcher, Okla. 73541 App No. 814,682 Filed Apr. 9, 1969Patented Mar. 16, 1971 CHIMNEY ASPIRATOR 1 Claim, 4 Drawing Figs.

U.S. C1 110/160, 98/60, 126/307 Int. C1 F231 17/02 Field of Search 1 10/1 60, 162, 184; 98/58, 59, 60; 126/307 References Cited UNITED STATESPATENTS 7/1893 Savage 110/184 11/1953 Valensi... 98/60 7/1955 McKann...126/307);

7/1958 Strawsine 126/307):

10/ 1960 Sublette 98/60:;

FOREiGN PATENTS 8/1951 France 98/60 Pn'mary Examiner-Edward G. FavorsAtt0rneyR0bert K. Rhea ney.

lNl/E/V TOR.

III!

MYRON E. HEMMINGSON 2/ II I 1 f Pateted CHIMNEY ASIP'IOR BACKGROUND OFTHE INVENTION 1. Field of the Invention The present invention relates tochimneys and more particularly to an aspirator for exhausting burnedgases from cooking stoves, and the like.

Restaurant stoves are normally provided with a hood for gathering smokeand burned gases and venting the latter to the atmosphere. The hood isusually equipped with filters which frequently become laden with greaseparticles carried by the smoke and become a fire hazard as a result ofinfrequent changing of the filters. Furthermore, that portion of thevent or chimney connected with the hood and projecting outside thebuilding is subjected to colder air resulting in deposit of grease andlint around the wall forming the bore of the vent and hampers exhaust ofburned gases therethrough.

2. Description of the Prior Art The prior art discloses a plurality ofdraft inducing devices for chimneys, and the like, such as US. Pat. Nos.1,454,561; 1,527,849; 1,533,898 and 1,689,241. The devices disclosed bythese patents are generally intended to be formed as an integral part ofa chimney during its construction or installation rather than for easein modifying existing chimneys. These devicesare, for the most part,intended to be installed within the dwelling below the roof line and inmany existing facilities there is insufficient room to accomplish suchinstallation. These patents do not disclose means to maintain thetemperature'of the burned gases outwardly of the building to avoid theresulting condensation of vaporized fat or grease carried by exhaustgases which tend to settle or deposit on the walls of the chimney.

This invention, on the other hand, by insulating that portion of thechimney projecting outwardly of a dwelling, eliminates temperaturereduction and the resultant grease deposit within the chimney andfurther enhances the flow of exhaust gases in an aspirating action. Thisinvention is particularly adapted for installation on most existingchimneys or stove vents.

SUMMARY OF THE INVENTION A layer of insulating material iscircumferentially applied to the exhaust end portion of a chimney orstove vent particularly in that area projecting outwardly of a building.A housing or jacket, having an exhaust port diametrically greater thanthe cross-sectional area of the chimney and having an inlet port, isconnected to the exhaust end of the chimney in loosely surroundingrelation. A motor driven fan communicates with the housing inlet portfor moving ambient air therethrough generating a venturi effect aroundthe exhaust opening of the chimney for exhausting burned gasestherefrom.

The principal object of this invention is to provide chimney aspiratingmeans for installation on or connection with new and existing chimneyswhich may ,be manufactured and installed at a relatively low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 11 is a vertical cross-sectionalview, partially in elevation, of one embodiment of the invention;

FIG. 2 is a horizontal cross-sectional view, partially in elevation,taken substantially along the line 2-2 of FIG. 1;

FIG. 3 is a view similar to FIG. 1 of another embodiment of theinvention; and

FIG. 4 is a horizontal cross-sectional view taken substantially alongthe line 4-4 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Like characters of referencedesignate like parts in those FIGS. of the drawings in which they occur.

Referring more particularly to FlGS. l and 2, the reference numeral It)indicates a conventional hood supported in vertical spaced relationabove the burners of a stove, grill, or the like to be vented. The upperportion of the hood is usually connected with an exhaust pipe or chimney12 which preferably extends upwardly of the hood through the ceiling androof, indicated respectively by the lines M and 16, terminating in anopen end portion 18 outwardly of the establishment. This open endportion 18 of the chimney 12 is subjected to ambient air resulting incondensation of fats and greases on the inner wall of the chimneyasmentioned hereinabove. This outer end portion of the chimney issurrounded by a layer of insulating material 20. A cylindrical housingor jacket 22 surrounds the insulating material 20 in spaced relation andprojects upwardly beyond the free end 18 of the chimney. The dependingend portion of the jacket is provided with an annular flange 24 adjacentthe roof 16 which is connected with the periphery of the chimney. Theupwardly disposed end of the jacket 22 is open and is provided with aplurality of spacedapart upstanding supports 26 connected with a ventcap 28.

A tube 30 projects laterally of the jacket and communicates with aninlet opening 32 formed in the housing wall below the upper limit of thefree end of the chimney. The tube 30 contains a motor driven fan 3% fordrawing air into the jacket and exhausting it out of its open end in thedirection of the arrows. Obviously the motor driven fan 34 may be of thevane type, commonly referred to as a squirrel cage fan, if desired,which moves a proportionally greater quantity of air than the typeillustrated, with the exhaust of such fan communicating with the jacketinlet 32.

Referring now more particularly to FIGS. 3 and 4, a modified form of thejacket is illustrated at 40 comprising a substantially cylindrical wall42 similarly loosely surrounding the outer end portion of the chimney12. The depending end of the jacket 40 is similarly provided with aflange 44 which surrounds and is connected with the chimney 12 adjacentthe roof line 16 while the upper end of the jacket 40 is provided withan end wall or top 46 overlying and substantially closing the upper end18 of the chimney 12. In this embodiment the upper end portion of thechimney outwardly of the roof line 16 is provided with a lateral outletport or opening 48 diametrically substantially equal to thecross-sectional area of the chimney. The wall of the jacket 40 isprovided with a lateral opening 50 coaxial with and diametricallygreater than the chimney port $8. The wall of the jacket 40 is similarlyprovided with an inlet port 52 diametrically opposite its exhaust port50 for connection with and coaxially receiving the tube 30 and motordriven fan 34 which may be substituted for a squirrel cage type fan, notshown, as mentioned hereinabove, for the embodiment of FIG. 1.

While the discharge end portion of the chimney 12 has been shown anddescribed as vertically disposed, it seems obvious that this inventionis equally adaptable for installation on horizontally disposed chimneydischarge end portions.

OPERATION In operation the motor driven fan 34 is connected with asource of electrical energy, not shown, which operates the fan to drawair into and through the respective jacket in the direction of thearrows. The volume of air thus moved, by the venturi action of itsoutlet port, having a greater diameter than its inlet port, tends todraw exhaust gases out of the chimney 12 in an aspirated or suctionaction thus enhancing the normal flow of heated gases out of thechimney. The insulating material 20 prevents a reduction of temperatureof the exhaust gases within the chimney which prevents condensation ofgrease particles, and the like, on the inner walls of the chimney.

Obviously the invention is susceptible to changes or alterations withoutdefeating its practicability, therefore, I do not wish to be confined tothe preferred embodiments shown in the drawings and described herein.

I claim:

1. In a heated gas exhaust system including a chimney having its exhaustend portion projecting through a building wall like, not shown,for-gathering exhaust gases, fumes and the and exposed to theatmosphere, the improvement comprising:

said jacket having an inlet opening in its wall adjacent its closed end,the other end of said jacket being open and projecting beyond theexhaust end of said chimney; a laterally extending tube connected withsaid jacket around the inlet opening; and a blower forcing air into saidjacket through said tube,

a vent cap shielding the open end of said jacket.

1. In a heated gas exhaust system including a chimney having its exhaustend portion projecting through a building wall and exposed to theatmosphere, the improvement comprising: insulating material surroundingthe exhaust end portion of said chimney; means for increasing heated gasflow through said chimney including a jacket having a wall coaxiallysurrounding the exhaust end portion of said chimney in spaced-apartrelation; a ring closing one end of said jacket and connecting saidjacket to the periphery of said chimney adjacent said building wall,said jacket having an inlet opening in its wall adjacent its closed end,the other end of said jacket being open and projecting beyond theexhaust end of said chimney; a laterally extending tube connected withsaid jacket around the inlet opening; and a blower forcing air into saidjacket through said tube, a vent cap shielding the open end of saidjacket.